Make Catalog::DoSaveOnly() more efficient
Make Catalog::DoSaveOnly() more efficient

Avoid using wxStringTokenizer in SplitIntoLines() and SaveMultiLines()
helpers that constitute the hot path to improve writing performance.

PKRoma/poedit,c72578/poedit,nawawi/poedit,c72578/poedit,nawawi/poedit,alexhenrie/poedit,PKRoma/poedit,alexhenrie/poedit,vslavik/poedit,alexhenrie/poedit,c72578/poedit,alexhenrie/poedit,nawawi/poedit,PKRoma/poedit,alexhenrie/poedit,vslavik/poedit,PKRoma/poedit,c72578/poedit,nawawi/poedit,vslavik/poedit,PKRoma/poedit,nawawi/poedit,vslavik/poedit,c72578/poedit,vslavik/poedit